Prerequisites - Cisco Catalyst 5000 Series Manual

LANE Token Ring Components
Note
FSSRP works only with LECS and LES/BUS combinations on Cisco devices. Third-party LANE
components interoperate with the LECS and LES/BUS functions of Cisco devices but cannot take
advantage of the redundancy features. Additionally, FSSRP-unaware LECs on Cisco equipment cannot
take advantage of FSSRP LES/BUS redundancy.
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lane config-atm address
atm-address template
Note
To avoid affecting the LES/BUS or LEC redundancy, do not override any LECS, LES, or BUS addresses.
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Prerequisites

Token Ring LANE requires that the Catalyst 5000 series switch contain one of the following ATM
modules running ATM software Release 4.9b or later:
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These ATM modules provide an ATM network interface for the Catalyst 5000 series switch. Network
interfaces reside on modular interface processors, which provide a direct connection between the high-
speed synergy backplane and the external networks. The maximum number of ATM modules that the
switch supports depends on the bandwidth configured.
The Catalyst 5000 series Token Ring LANE software also requires the Catalyst 5000 series supervisor
engine software Release 4.3(1a) or later and one of the following switches:
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and LECSs, LANE components can switch automatically to the backup LES/BUS or LECS if the
primary server fails. For specific information on how to configure FSSRP, refer to the
Fast SSRP for Redundant LANE Services, page 24
When a higher-priority LES comes online, it bumps the current LES off the same ELAN. For a short
time after power on, some clients might change from one LES to another, depending upon the order of
the LESs coming up.
If no LES/BUS pair is up or connected to the master LECS, and more than one LES/BUS is defined
for an ELAN, the LECS rejects any configuration request for that specific ELAN.
Changes made to the list of LECS addresses on ATM switches can take up to 1 minute to propagate
through the network. Changes made to the LECS database regarding LES addresses take effect almost
immediately.
If no LECS is operational or reachable, the "well-known" LECS address defined by the ATM Forum is
used.
The LECS to be used can be overridden on any subinterface by entering the following command:
In an underlying ATM network failure, there can be multiple master LECS and multiple active LESs
or BUSs for the same ELAN, resulting in a partitioned network. Clients continue to operate normally,
but transmission between partitions of the network is not possible. The system recovers when the
network break is repaired.
ATM Dual PHY OC-12 (WS-X5161 and WS-X5162)
ATM Dual PHY OC-3 (WS-X5167 and WS-X5168)
Cisco LightStream 1010 with Cisco IOS Release 12.0(1)W5 or later (recommended)
section.
Prerequisites
Configuring
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